/*
 *
 *
 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
 *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/*

   This source file is specifically designed to interface with the
   cx2584x, in kernels 2.6.16 or newer.

*/

#include "pvrusb2-cx2584x-v4l.h"
#include "pvrusb2-video-v4l.h"
#include "pvrusb2-i2c-cmd-v4l2.h"


#include "pvrusb2-hdw-internal.h"
#include "pvrusb2-debug.h"
#include <media/cx25840.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <linux/errno.h>
#include <linux/slab.h>

struct pvr2_v4l_cx2584x {
	struct pvr2_i2c_handler handler;
	struct pvr2_decoder_ctrl ctrl;
	struct pvr2_i2c_client *client;
	struct pvr2_hdw *hdw;
	unsigned long stale_mask;
};


struct routing_scheme_item {
	int vid;
	int aud;
};

struct routing_scheme {
	const struct routing_scheme_item *def;
	unsigned int cnt;
};

static const struct routing_scheme_item routing_scheme0[] = {
	[PVR2_CVAL_INPUT_TV] = {
		.vid = CX25840_COMPOSITE7,
		.aud = CX25840_AUDIO8,
	},
	[PVR2_CVAL_INPUT_RADIO] = { /* Treat the same as composite */
		.vid = CX25840_COMPOSITE3,
		.aud = CX25840_AUDIO_SERIAL,
	},
	[PVR2_CVAL_INPUT_COMPOSITE] = {
		.vid = CX25840_COMPOSITE3,
		.aud = CX25840_AUDIO_SERIAL,
	},
	[PVR2_CVAL_INPUT_SVIDEO] = {
		.vid = CX25840_SVIDEO1,
		.aud = CX25840_AUDIO_SERIAL,
	},
};

/* Specific to gotview device */
static const struct routing_scheme_item routing_schemegv[] = {
	[PVR2_CVAL_INPUT_TV] = {
		.vid = CX25840_COMPOSITE2,
		.aud = CX25840_AUDIO5,
	},
	[PVR2_CVAL_INPUT_RADIO] = {
		/* line-in is used for radio and composite.  A GPIO is
		   used to switch between the two choices. */
		.vid = CX25840_COMPOSITE1,
		.aud = CX25840_AUDIO_SERIAL,
	},
	[PVR2_CVAL_INPUT_COMPOSITE] = {
		.vid = CX25840_COMPOSITE1,
		.aud = CX25840_AUDIO_SERIAL,
	},
	[PVR2_CVAL_INPUT_SVIDEO] = {
		.vid = (CX25840_SVIDEO_LUMA3|CX25840_SVIDEO_CHROMA4),
		.aud = CX25840_AUDIO_SERIAL,
	},
};

static const struct routing_scheme routing_schemes[] = {
	[PVR2_ROUTING_SCHEME_HAUPPAUGE] = {
		.def = routing_scheme0,
		.cnt = ARRAY_SIZE(routing_scheme0),
	},
	[PVR2_ROUTING_SCHEME_GOTVIEW] = {
		.def = routing_schemegv,
		.cnt = ARRAY_SIZE(routing_schemegv),
	},
};

static void set_input(struct pvr2_v4l_cx2584x *ctxt)
{
	struct pvr2_hdw *hdw = ctxt->hdw;
	struct v4l2_routing route;
	enum cx25840_video_input vid_input;
	enum cx25840_audio_input aud_input;
	const struct routing_scheme *sp;
	unsigned int sid = hdw->hdw_desc->signal_routing_scheme;

	memset(&route,0,sizeof(route));

	if ((sid < ARRAY_SIZE(routing_schemes)) &&
	    ((sp = routing_schemes + sid) != NULL) &&
	    (hdw->input_val >= 0) &&
	    (hdw->input_val < sp->cnt)) {
		vid_input = sp->def[hdw->input_val].vid;
		aud_input = sp->def[hdw->input_val].aud;
	} else {
		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
			   "*** WARNING *** i2c cx2584x set_input:"
			   " Invalid routing scheme (%u) and/or input (%d)",
			   sid,hdw->input_val);
		return;
	}

	pvr2_trace(PVR2_TRACE_CHIPS,"i2c cx2584x set_input vid=0x%x aud=0x%x",
		   vid_input,aud_input);
	route.input = (u32)vid_input;
	pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_VIDEO_ROUTING,&route);
	route.input = (u32)aud_input;
	pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_AUDIO_ROUTING,&route);
}


static int check_input(struct pvr2_v4l_cx2584x *ctxt)
{
	struct pvr2_hdw *hdw = ctxt->hdw;
	return hdw->input_dirty != 0;
}


static void set_audio(struct pvr2_v4l_cx2584x *ctxt)
{
	u32 val;
	struct pvr2_hdw *hdw = ctxt->hdw;

	pvr2_trace(PVR2_TRACE_CHIPS,"i2c cx2584x set_audio %d",
		   hdw->srate_val);
	switch (hdw->srate_val) {
	default:
	case V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000:
		val = 48000;
		break;
	case V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100:
		val = 44100;
		break;
	case V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000:
		val = 32000;
		break;
	}
	pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_AUDIO_CLOCK_FREQ,&val);
}


static int check_audio(struct pvr2_v4l_cx2584x *ctxt)
{
	struct pvr2_hdw *hdw = ctxt->hdw;
	return hdw->srate_dirty != 0;
}


struct pvr2_v4l_cx2584x_ops {
	void (*update)(struct pvr2_v4l_cx2584x *);
	int (*check)(struct pvr2_v4l_cx2584x *);
};


static const struct pvr2_v4l_cx2584x_ops decoder_ops[] = {
	{ .update = set_input, .check = check_input},
	{ .update = set_audio, .check = check_audio},
};


static void decoder_detach(struct pvr2_v4l_cx2584x *ctxt)
{
	ctxt->client->handler = NULL;
	pvr2_hdw_set_decoder(ctxt->hdw,NULL);
	kfree(ctxt);
}


static int decoder_check(struct pvr2_v4l_cx2584x *ctxt)
{
	unsigned long msk;
	unsigned int idx;

	for (idx = 0; idx < ARRAY_SIZE(decoder_ops); idx++) {
		msk = 1 << idx;
		if (ctxt->stale_mask & msk) continue;
		if (decoder_ops[idx].check(ctxt)) {
			ctxt->stale_mask |= msk;
		}
	}
	return ctxt->stale_mask != 0;
}


static void decoder_update(struct pvr2_v4l_cx2584x *ctxt)
{
	unsigned long msk;
	unsigned int idx;

	for (idx = 0; idx < ARRAY_SIZE(decoder_ops); idx++) {
		msk = 1 << idx;
		if (!(ctxt->stale_mask & msk)) continue;
		ctxt->stale_mask &= ~msk;
		decoder_ops[idx].update(ctxt);
	}
}


static void decoder_enable(struct pvr2_v4l_cx2584x *ctxt,int fl)
{
	pvr2_trace(PVR2_TRACE_CHIPS,"i2c cx25840 decoder_enable(%d)",fl);
	pvr2_v4l2_cmd_stream(ctxt->client,fl);
}


static int decoder_detect(struct pvr2_i2c_client *cp)
{
	int ret;
	/* Attempt to query the decoder - let's see if it will answer */
	struct v4l2_queryctrl qc;

	memset(&qc,0,sizeof(qc));

	qc.id = V4L2_CID_BRIGHTNESS;

	ret = pvr2_i2c_client_cmd(cp,VIDIOC_QUERYCTRL,&qc);
	return ret == 0; /* Return true if it answered */
}


static unsigned int decoder_describe(struct pvr2_v4l_cx2584x *ctxt,
				     char *buf,unsigned int cnt)
{
	return scnprintf(buf,cnt,"handler: pvrusb2-cx2584x-v4l");
}


static void decoder_reset(struct pvr2_v4l_cx2584x *ctxt)
{
	int ret;
	ret = pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_RESET,NULL);
	pvr2_trace(PVR2_TRACE_CHIPS,"i2c cx25840 decoder_reset (ret=%d)",ret);
}


static const struct pvr2_i2c_handler_functions hfuncs = {
	.detach = (void (*)(void *))decoder_detach,
	.check = (int (*)(void *))decoder_check,
	.update = (void (*)(void *))decoder_update,
	.describe = (unsigned int (*)(void *,char *,unsigned int))decoder_describe,
};


int pvr2_i2c_cx2584x_v4l_setup(struct pvr2_hdw *hdw,
			       struct pvr2_i2c_client *cp)
{
	struct pvr2_v4l_cx2584x *ctxt;

	if (hdw->decoder_ctrl) return 0;
	if (cp->handler) return 0;
	if (!decoder_detect(cp)) return 0;

	ctxt = kzalloc(sizeof(*ctxt),GFP_KERNEL);
	if (!ctxt) return 0;

	ctxt->handler.func_data = ctxt;
	ctxt->handler.func_table = &hfuncs;
	ctxt->ctrl.ctxt = ctxt;
	ctxt->ctrl.detach = (void (*)(void *))decoder_detach;
	ctxt->ctrl.enable = (void (*)(void *,int))decoder_enable;
	ctxt->ctrl.force_reset = (void (*)(void*))decoder_reset;
	ctxt->client = cp;
	ctxt->hdw = hdw;
	ctxt->stale_mask = (1 << ARRAY_SIZE(decoder_ops)) - 1;
	pvr2_hdw_set_decoder(hdw,&ctxt->ctrl);
	cp->handler = &ctxt->handler;
	{
		/*
		  Mike Isely <isely@pobox.com> 19-Nov-2006 - This bit
		  of nuttiness for cx25840 causes that module to
		  correctly set up its video scaling.  This is really
		  a problem in the cx25840 module itself, but we work
		  around it here.  The problem has not been seen in
		  ivtv because there VBI is supported and set up.  We
		  don't do VBI here (at least not yet) and thus we
		  never attempted to even set it up.
		 */
		struct v4l2_format fmt;
		memset(&fmt,0,sizeof(fmt));
		fmt.type = V4L2_BUF_TYPE_SLICED_VBI_CAPTURE;
		pvr2_i2c_client_cmd(ctxt->client,VIDIOC_S_FMT,&fmt);
	}
	pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x cx2584x V4L2 handler set up",
		   cp->client->addr);
	return !0;
}


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